void HMAC_Base::UncheckedSetKey(const byte *userKey, unsigned int keylength) { AssertValidKeyLength(keylength); Restart(); HashTransformation &hash = AccessHash(); unsigned int blockSize = hash.BlockSize(); if (!blockSize) throw InvalidArgument("HMAC: can only be used with a block-based hash function"); if (keylength <= blockSize) memcpy(AccessIpad(), userKey, keylength); else { AccessHash().CalculateDigest(AccessIpad(), userKey, keylength); keylength = hash.DigestSize(); } assert(keylength <= blockSize); memset(AccessIpad()+keylength, 0, blockSize-keylength); for (unsigned int i=0; i<blockSize; i++) { AccessOpad()[i] = AccessIpad()[i] ^ OPAD; AccessIpad()[i] ^= IPAD; } }
void HMAC_Base::UncheckedSetKey(const byte *userKey, unsigned int keylength, const NameValuePairs &) { AssertValidKeyLength(keylength); Restart(); HashTransformation &hash = AccessHash(); unsigned int blockSize = hash.BlockSize(); if (!blockSize) throw InvalidArgument("HMAC: can only be used with a block-based hash function"); m_buf.resize(2*AccessHash().BlockSize() + AccessHash().DigestSize()); if (keylength <= blockSize) memcpy(AccessIpad(), userKey, keylength); else { AccessHash().CalculateDigest(AccessIpad(), userKey, keylength); keylength = hash.DigestSize(); } CRYPTOPP_ASSERT(keylength <= blockSize); memset(AccessIpad()+keylength, 0, blockSize-keylength); for (unsigned int i=0; i<blockSize; i++) { AccessOpad()[i] = AccessIpad()[i] ^ 0x5c; AccessIpad()[i] ^= 0x36; } }
void HMAC_Base::KeyInnerHash() { assert(!m_innerHashKeyed); HashTransformation &hash = AccessHash(); hash.Update(AccessIpad(), hash.BlockSize()); m_innerHashKeyed = true; }